快速理解js闭包

function makeAdder(x) {
  return function(y) {
    return x + y;
  };
}

var add5 = makeAdder(5);
var add10 = makeAdder(10);

console.log(add5(2));  // 7
console.log(add10(2)); // 12

function makeFunc() {
    var name = "Mozilla"
    var cnt = 0;
    var toggle = false;
    return function() {
        toggle = !toggle;
        console.log(cnt++ + " " + name + " " + toggle + " ");
    };
}

var caller = makeFunc();

function trigger(calller) {
    calller();
}

for (var i = 5; i >= 0; i--) {
   caller();
}

trigger(makeFunc());
trigger(caller);

var student = (function() {
    var name = "";
    return {
        set: function(n) {
            name = n;
        },
        get: function() {
            return name;
        }
    }
})();

student.set("ydlme");
console.log(student.get());